Thomas cochean



(No Madel.)

T. UOOHRAN. Circuit Equalizer for Telegraph Sounders.

Patented June 15,1880.

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UNITED STATES PATENT OEEieE,

THOMAS COOHRAN, OF BROOKLYN, NET V YORK.

CIRCUIT-EQUALIZER FOR TELEGRAPH-SOUNDERS.

SPECIFICATION forming part of Letters Patent No. 228,871, dated June 15, 1880.

Application filed April 28, 1880. (No model.)

To all whom it may concern Be itknown that I, THOMAS OoonRAN, a citizen of the United States, residing at Brooklyn, in the county of Kings and State of New York, have invented new and useful Improvements in Oircuit-Equalizers, of which the following is a specification.

This invention consists in the combination, with the line-wire for an electric circuit, of a main switch, two or more sounders or receiving-instruments, and one or more intermediate switches, so that by adjusting the switches either of the receiving-instruments, or two or more of the same, can. be put upon the line, and the force of the current which acts on the receiving instrument or sounder which is brought in operation can be readily regulated to correspond to the resistance for which sounder is adjusted; or such a sounder can be placed in the line the resistance of which corresponds to the motive force of the line-eurrent.

It consists,further,in the combination of a switch and a series of buttons with an electromagnet, the buttons and switch being secured to one of the heads of the helix, while the wire which forms the helix is connected to the several buttons, so that by moving the switch from one button to another the resistance produced by the coil can be adjusted from twenty-live to two hundred and lit'ty (more or less) ohms, as the line may require.

In the drawings, Figure 1, the letter A designates a switch, which has its fulcrum on a pivot, a, secured in a board,D. In this board are fastened a series of metallic studs, 1 2 3 at 5, in the segment of a circle described from the pivot to, so that when the switch is turned it sweeps over said studs.

S S S are three sounders or receiving-instruments, which are preferably adjusted to different tensions, and made of any suitable construction, and with these sounders are combined secondary or intermediate switches, 0 0

B is the main battery, one pole of which connects with the line-wire 10, while its other pole connects with the ground. The line-wire is connected to the pivot a of the main switch A, and the stud l connects by a wire, 11, with one end of the helix of the sounder S. The

opposite end of this helix connects by a wire, 12, with a stud, 0, in an intermediate switch, O, which also contains a stud, d, that connects with the line-wire 10. The stud 2 in the main switch connects by a wire, 13, with a stud, e, in the intermediate switch, 0, and a stud,f, in this switch connects by a wire, 14, with one end of the helix oi" the sounder S the opposite end of said helix being connected by a wire, 15, with a stud, in the intermediate switch 0, which contains a stud, /L, that connects by a wire, 16, with the line-wire. The stud 3 in the main switch connects by a wire, 17, with a stud, i, in the intermediate switch O and a stud,j, in this switch connects by a wire, 18, with one end of the helix of the sounder S the opposite end of said helix being connected by a wire, 19, with the line-wire 10.

The sounders S S S are, by preference, so constructed that the sounder S has the least resistance, corresponding to the smallest possible force of the line-current, while the resistance of the sounder S is somewhat larger than that of the sounder S, and that of the sounder S again larger than that ofthe sounder S. It" the force of the line-current is very small the main switch A is turnedon the stud 1, and the intermediate switch 0 is made to cover the studs 0 d, causing the line-current to pass directly through the helix of the sounder S. If the force of the line current increases the main switch is turned on stud 2, and the intermediate switches, O 0 are adjusted as shown in the drawings, and the line-current passes through the helix of sounder S It the force of the line-current increases still further the switches are so adjusted that the sounder S is thrown in the line-current, and it the force of the linc'current increases still further the main switch A is turned on the stud 1, and the intermediate switch O is turned so that it covers the studs 0 and f, and in this case the Iinecurrent has to pass through the helix of the sounder S before it reaches the sounder S and consequently the force of the line-current is diminished by the resistance of the helix of the sounder S before it acts on the sounder S. From these examples it will be readily understood that by proper manipulation of the switches A O O the line-current can be made to pass through either of the sounders S S S or through two or more of them, and thereby the force of the current acting on the sounder which is brought in operation canbe readily regulated to correspond to the resistance for which said sounder is adjusted.

In order to be able to adjust the resistance of each sounder I secure on the head of each electro magnet a switch, F 1 Fig. 2, which turns on a pivot, 7c 7t, and sweeps overa series of buttons, 1 m n 0 Z m a 0'1). The magnets are then wound to a resistance of, say, twenty-rim ohms each; then the wire is connected to button Z, without breaking it, however; then it is wound with a resistance of another twenty-five ohms, and connected to the next button, and so on, each button in creasing the resistance twenty-five ohms, so that when the magnets contain live buttons their combined resistance will be two hundred and fifty ohms.

In the example shown in the drawings the line-wire 10 connects to the inner end of the helix G, and the pivot of the switch 1* connects with the inner end of the helix G, while the pivot 70 of the switch F connects with the line-wire. By turning the switches F F the resistance of the helices G G can be increased or diminished, as may be desirable.

What I claim as new and desire to secure by Letters Patent, is-- 1. The combination, with the line-wire of a telegraph or other line of a main switch, two or more sounders or receiving-i1'1struments, and one or more intermediate switches, substantially as and for the purpose described.

2. The COlllblllitlilOll,\Vlbll an electro-magnet, of a switch and a series of buttons, the buttons and the switch being secured to one of the heads of the electro-magnet, while the wire which forms the helix ot' the electro-magnet is in metallic connection with theseveral but; tons, substantially as and for the purpose shown and described.

In testimony whereof I have hereunto set my hand and seal in the presence of two subscribing witnesses.

THOMAS GOUHRAN.

Witnesses J. G. MILLIGAN, W. HAUFF. 

